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Topic Review (Newest First)

11-08-2012 02:35 PM

mike lost in cars

hi you are correct they are making it harder than it is if your 350 is from a late 90's truck and you just want to put a turbo or super charger or nos about 400hp should be ok but keep in mind as some one said the rpm's could kill keep your self under 5k rpm great but max it out 6k you will blow the stock motor fast i made a twin turbo kit on a 85 camaro 350 fully stock got 523 hp used it for almost 4 years and sold it still running but i never let it go over 5,250 rpm i hope this helps you

11-04-2012 08:36 PM

1Gary

Quote:

Originally Posted by Custom10

Back to the OP original ask, I cant possibly be part of the current scientific equation currently being beat to death.

Put a 150HP NOS shot on a 68 307 once. so thats 180HP + 150HP = too much HP. Ran it once with a full bottle and a bush leage fuel supply to the solenoids to most likely 7000+RPM at which time it blew itself through the hood of the 68 belair,,,my mom was pissed right off,,,she liked that car.

That's funny.LOL

11-04-2012 08:13 PM

Custom10

Back to the OP original ask, I cant possibly be part of the current scientific equation currently being beat to death.

Put a 150HP NOS shot on a 68 307 once. so thats 180HP + 150HP = too much HP. Ran it once with a full bottle and a bush leage fuel supply to the solenoids to most likely 7000+RPM at which time it blew itself through the hood of the 68 belair,,,my mom was pissed right off,,,she liked that car.

11-04-2012 06:55 PM

1Gary

Quote:

Originally Posted by allansmith859

I didnt mean anything bad by that. I was sayin that you answered my question and I thank you for that.

Thanks for that.I would back the rpm to 5,500 and the intake to 180cc to keep the viscosity up for better low end response.

11-04-2012 05:54 PM

allansmith859

I would be buying a new rotating assembly for this. But everything would be stock replacement parts except if I have to go .030 over then I will have to get bigger pistons. Jegs sell a scat rotating assembly thats around 500 to 600 dollars and thats probably the route ill go. Just trying to build a good strong engine. Its not a race engine. I guess I dont even need to put the max HP that these parts would handle but 450 does sound very good to me. That would be perfect. I appreciate everyones advise even if it seems like I dont. I have tore down alot of sbc by myself and learned how to do it by myself with none to teach me anything. But those were just stock rebuild using the same parts i took off. Just putting on new bearings and gaskets. I am still young and I am trying to get to where you all are when it comes to building a good performance engine. I really am not trying to be a pain in the ***.

Thank you guys for your input

11-04-2012 05:38 PM

ap72

Quote:

Originally Posted by allansmith859

I have a sbc 350 I plan on building for street/strip project. I am taking it to my machine shop to get it re done. (.030) I plan on using STOCK GM PARTS for my rotating assembly. (crank, rods, bearings, pistons, ect). How much HP/TQ can these parts withstand so I know what my options are when i get my top end?? (cam, heads, intake, carb, exhaust). I will use ARP bolts.

You can't put stock pistons in a .030" over block... And if you're taking the crank you then you better not put the bearings back in.

As or what the crank and rods can handle (the only parts you'll be reusing) if they are properly machined and assembled then you should have no problems going up to 6,000 rpm. With that as your max RPM you'll want your peak a little before that, with good 195-210cc aftermarket heads you can get around 450hp out of a 350 if everything is built right- no shortcuts though.

11-04-2012 05:22 PM

allansmith859

I didnt mean anything bad by that. I was sayin that you answered my question and I thank you for that.

11-04-2012 01:43 PM

1Gary

Glad you liked it.I thought you would.............

Thing is I really don't care for a guy asking for advise and then being told what to say.

Soooo,I done with this.

11-04-2012 09:57 AM

allansmith859

Thanks you answered it perfectly in the first couple sentences

11-04-2012 09:46 AM

1Gary

Quote:

Originally Posted by allansmith859

I have a sbc 350 I plan on building for street/strip project. I am taking it to my machine shop to get it re done. (.030) I plan on using STOCK GM PARTS for my rotating assembly. (crank, rods, bearings, pistons, ect). How much HP/TQ can these parts withstand so I know what my options are when i get my top end?? (cam, heads, intake, carb, exhaust). I will use ARP bolts.

I think this is a two part question.Playing it conservative with a cast crank 400hp no problem,500hp still limited risk,but that is going to come down to the power curve and if you start hooking the car hard,the car's wt,rpm range,etc.

The second part of the question I think comes down to the SCR/DCR and today's gas if you planning for iron heads or are going to elect for aftermarket aluminum heads and then cam selection.

Apart of the machine work aside from a over bore "could" include decking the block and if you do so that could be 0 deck or .010 down.At the very least you should have the machine shop check the deck to be sure it is flat.

These days compression dictates cam choices,head selection,even exhaust which needs to include consideration for trans gearing or trans choices, rear end gear ratios,and tire size.You want to tailor you power curve so you right at the beginning of it off idle or shortly there after for a street driven car.Those loopy idle's sound kewl,but don't do much for you when the cam starts to come in at like 3,500/4,000 rpm.

The catch 22 is the physics is relativity smaller c.i. engines do produce their power band at a higher rpm band.So that development of a power band would be higher with a 350/355 vs a 383 which would be at a lower rpm range.

So the msg here is for you to plan out your build in the big picture.Don't plan on nitrous big shots with a stock bottom end.

Hope this helps.

11-04-2012 08:25 AM

allansmith859

I have a sbc 350 I plan on building for street/strip project. I am taking it to my machine shop to get it re done. (.030) I plan on using STOCK GM PARTS for my rotating assembly. (crank, rods, bearings, pistons, ect). How much HP/TQ can these parts withstand so I know what my options are when i get my top end?? (cam, heads, intake, carb, exhaust). I will use ARP bolts.

11-03-2012 09:58 AM

E.Furgal

Quote:

Originally Posted by Mr. P-Body

1Gary,

Good description of the situation.

O/P, you asked a most "generic" question. Please be more specific in the future to avoid all this. As you probably have surmised, such an open question is not valid. Some of us do this stuff for a living. We give our time here to "better" the hobby. We ask nothing in return. A little help would help us help you better.

Chevy made a 370 HP 350... A stock forged bottom end can easily withstand 600-plus HP.

Jim

with stock bolts or arp studs

I can tell you what happens at 540hp with stock 4 bolts..

11-03-2012 09:19 AM

Mr. P-Body

1Gary,

Good description of the situation.

O/P, you asked a most "generic" question. Please be more specific in the future to avoid all this. As you probably have surmised, such an open question is not valid. Some of us do this stuff for a living. We give our time here to "better" the hobby. We ask nothing in return. A little help would help us help you better.

Chevy made a 370 HP 350... A stock forged bottom end can easily withstand 600-plus HP.

Jim

11-02-2012 04:37 AM

allansmith859

Well guys after sitting back and enjoying all of your fighting and bickering I thank you guys who answered my question simpley and not making it more than exactly what the question was. This was a good debate.

11-01-2012 10:23 PM

1Gary

Quote:

Originally Posted by BadBanana

Yep, back in the late 50s I couldn't afford a Muncie 4 speed and a set of 4.56 or 4.88 gears; so I rebuilt a 3 speed with the 6 cyl gears because of a 2.94 first gear ratio instead of the close ratio 2.2. We used what we could afford and make by ourselves. That's what gave us our ingenuity that even helped us later on when we could afford better parts.
Don't know why these posts always turn into "who shot John" This will be my last or second last post before I "unsubscribe" !!!

BadBanana yrs ago was a 57 Chevy wagon that I think won at Indy.Raced at Lancaster speedway and at Niagara.Was a local hero.You that guy??. I think Gary Westfall was one haft of a partnership in the car.

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